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Cartesia Sonic 3
What ChatGPT, Claude, Gemini & Grok actually say · July 2026
The verdict
Cartesia Sonic 3 appears in 1 AI-ranked category — best position #5 for text-to-speech api for voice agents.
GPT #1Claude —Gemini —Grok —
Best overall balance of ultra-low latency, natural conversational prosody, reliable streaming, voice cloning, and fine-grained speed/emotion controls purpose-built for real-time agents
What would move Cartesia Sonic 3 up
- GPT Expand language coverage to match ElevenLabs
Top alternatives per the models: ElevenLabs · Cartesia · Deepgram · Inworld
Rankings are computed from what the models answer, re-polled continuously · raw reasoning shown verbatim · methodology